// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#pragma once

// Helper RAII over unix udp client socket.
// Will throw on construction if the socket creation failed.

#ifdef _WIN32
#error "include udp_client-windows.h instead"
#endif

#include <arpa/inet.h>
#include <cstring>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <spdlog/common.h>
#include <spdlog/details/os.h>
#include <sys/socket.h>
#include <unistd.h>

#include <string>

namespace spdlog {
namespace details {

    class udp_client
    {
        static constexpr int TX_BUFFER_SIZE = 1024 * 10;
        int socket_ = -1;
        struct sockaddr_in sockAddr_;

        void cleanup_()
        {
            if (socket_ != -1)
            {
                ::close(socket_);
                socket_ = -1;
            }
        }

    public:
        udp_client(const std::string& host, uint16_t port)
        {
            socket_ = ::socket(PF_INET, SOCK_DGRAM, 0);
            if (socket_ < 0)
            {
                throw_spdlog_ex("error: Create Socket Failed!");
            }

            int option_value = TX_BUFFER_SIZE;
            if (::setsockopt(socket_, SOL_SOCKET, SO_SNDBUF, reinterpret_cast<const char*>(&option_value), sizeof(option_value)) < 0)
            {
                cleanup_();
                throw_spdlog_ex("error: setsockopt(SO_SNDBUF) Failed!");
            }

            sockAddr_.sin_family = AF_INET;
            sockAddr_.sin_port = htons(port);

            if (::inet_aton(host.c_str(), &sockAddr_.sin_addr) == 0)
            {
                cleanup_();
                throw_spdlog_ex("error: Invalid address!");
            }

            ::memset(sockAddr_.sin_zero, 0x00, sizeof(sockAddr_.sin_zero));
        }

        ~udp_client() { cleanup_(); }

        int fd() const { return socket_; }

        // Send exactly n_bytes of the given data.
        // On error close the connection and throw.
        void send(const char* data, size_t n_bytes)
        {
            ssize_t toslen = 0;
            socklen_t tolen = sizeof(struct sockaddr);
            if ((toslen = ::sendto(socket_, data, n_bytes, 0, (struct sockaddr*)&sockAddr_, tolen)) == -1)
            {
                throw_spdlog_ex("sendto(2) failed", errno);
            }
        }
    };
}  // namespace details
}  // namespace spdlog
